Question

3. The average score of a group of 15 students is 80.
When one student left the group, the average score
of the group came down by 1. What is the score of
the person who left the group?
Please explain in details​

Answer 1

Answer:

I Can't Solve Same Answer You Should Practice

But Yes The Way I Can Tell To Solve

by Putting Other Numbers

Plz Mark as Brainiest

Step-by-step explanation:

The average mark of 70 students in a class is 80. Out of these 70 students, if the average mark of 40 students is 75, what is the average mark of the remaining 30 students?

I am sure every one of you will be able to answer this in the following way.

Average of 70 students = 80.

Hence total marks of all the 70 students = 70x80 = 5600

Out of these 70, average of 40 students = 75

Hence total marks of these 40 students = 40x75 = 3000.

So the total marks of the remaining 30 students = 5600-3000 = 2600

Hence the average of the remaining 30 students = 2600/30 = 86.66

Similarly You Try For Practicing !!

Answer 2

Answer:

The score of person who left is $94$.

Step-by-step explanation:

It is given that the average score of fifteen students is $80$.

When one student left the group, the average score of the group came down by $1$.

We need to determine the score of the person who left.

Average is defined as the ratio of sum of observation to total number of observations.

Mathematically,

$80=Sum/15$

$Sum=1200$

When one person left,

$79=Sum/14$

$Sum=1106$

The score of person who left is $1200-1106$

$=94$

Score of person who left is $94$.

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